When K1 was in 5th grade they learned French songs using YouTube. They learned this one by Francis Cabrel - Il Faudra Leur Dire.
Now that K2 is in 3rd grade, there seems to be more YouTube in the classroom. This time, it’s Yannick Noah - I remember him only as a tennis player.
Aux arbres citoyens seems to be a favorite. Les Lionnes is another and so is La Voix Des Sages.